1.02950

Dimethyl sulfoxide

for spectroscopy Uvasol^®

• Synonym(s): Methanesulfinylmethane, Methyl sulfoxide, Dimethyl(oxido)sulfur, DMSO, DMSO
• Linear Formula: (CH₃)₂SO
• CAS Number: 67-68-5
• Molecular Weight: 78.13
• Beilstein: 506008
• MDL number: MFCD00002089
• EC Index Number: 200-664-3

Properties

• vapor density: 2.7 (vs air)
• Quality Level: 100
• vapor pressure: 0.42 mmHg ( 20 °C)
• Assay: ≥99.8% (GC)
• form: liquid
• autoignition temp.: 573 °F
• potency: 28300 mg/kg LD₅₀, oral (Rat); 40000 mg/kg LD₅₀, skin (Rat)
• expl. lim.: 42 %, 63 °F
• technique(s): UV/Vis spectroscopy: suitable
• impurities: ≤0.0002 meq/g Acidity; ≤0.0002 meq/g Alkalinity; ≤0.05% Water
• evapn. residue: ≤0.0004%
• color: APHA: ≤10
• transmittance: 270 nm, ≥35%; 280 nm, ≥50%; 310 nm, ≥80%; 330 nm, ≥90%; 350 nm, ≥97%
• refractive index: n20/D 1.479 (lit.)
• kinematic viscosity: 2.14 cSt
• bp: 189 °C (lit.)
• mp: 16-19 °C (lit.)
• transition temp: flash point 87 °C
• density: 1.10 g/mL (lit.)
• UV absorption: λ: 270 nm A_max: ≤0.46; λ: 280 nm A_max: ≤0.30; λ: 310 nm A_max: ≤0.10; λ: 330 nm A_max: ≤0.05; λ: 350 nm A_max: ≤0.013
• storage temp.: 2-30°C
• SMILES string: CS(C)=O
• InChI: 1S/C2H6OS/c1-4(2)3/h1-2H3
• InChI key: IAZDPXIOMUYVGZ-UHFFFAOYSA-N

Description

General description

Accurate analytic results in UV/VIS and infrared spectroscopy depend on the use of very pure solvents for sample preparation. The Uvasol<TMSYMBOL></TMSYMBOL> solvents range has been specially designed for spectroscopy and other applications requiring solvents of the highest spectral purity. The refinement process allows a greater degree of security in applications and avoids misinterpretation of analytical results caused by traces of UV, IR and fluorescence contamination. Uvasol<TMSYMBOL></TMSYMBOL> solvents offer best UV transmittance. In all specifications the minimum transmittance for 5 typical wavelengths are identified.

Caution

Supercools easily and remelts slowly at room temperature. Solidified product can be re-liquified by warming to room temperature without detriment to the product.

Specifications

Saturation Concentration in Air: 8.0 g/m3 (20 °C)

Analysis Note

Purity (GC): ≥ 99.8 %
Evaporation residue: ≤ 0.0004 %
Water: ≤ 0.05 %
Color: ≤ 10 Hazen
Acidity: ≤ 0.0002 meq/g
Alkalinity: ≤ 0.0002 meq/g
Transmission (at 270 nm): ≥ 35 %
Transmission (at 280 nm): ≥ 50 %
Transmission (at 310 nm): ≥ 80 %
Transmission (at 330 nm): ≥ 90 %
Transmission (from 350 nm): ≥ 97 %
Absorbance (at 270 nm): ≤ 0.46
Absorbance (at 280 nm): ≤ 0.30
Absorbance (at 310 nm): ≤ 0.10
Absorbance (at 330 nm): ≤ 0.05
Absorbance (from 350 nm): ≤ 0.013

Legal Information

UVASOL is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Storage Class Code: 10 - Combustible liquids
• WGK: WGK 1
• Flash Point(F): 188.6 °F - closed cup
• Flash Point(C): 87 °C - closed cup